Taurus Ceti IV

From Memory Alpha, the free Star Trek reference

Taurus Ceti IV is the fourth planet in the Taurus Ceti system. Captain Kathryn Janeway found her dog, Mollie, as a puppy in a pound on Taurus Ceti IV. (VOY: "Shattered")

The planet may have been intended to be Tau Ceti IV, since Janeway's father died on Tau Ceti Prime.